[Buildbot] #3393: Shut down EC2 instances after prolonged disconnection from master

[Buildbot trac]

#3393: Shut down EC2 instances after prolonged disconnection from master
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Reporter:  dustin       |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  major        |  Milestone:  0.9.+
 Version:  master       |   Keywords:  ec2, ec2cost
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 Right now, there are a number of ways for an EC2 instance to become
 "stranded", where it's not connected to the master, but still running and
 thus costing the user perfectly good beer money.

 The buildslave should optionally have a way to halt the host it is running
 on when it is disconnected for a while.  Config knobs:

  * `haltWhenDisconnectedFor` - # of seconds of continuous disconnection
  * `haltWhenDisconnectedCommand` - command line to use for halting (e.g.,
 `sudo halt`)

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Ticket URL: <http://trac.buildbot.net/ticket/3393>
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